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Videos de Conceptos Relacionados

Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Chromosome Structure02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
Chromosome Replication02:31

Chromosome Replication

Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin of...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

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Video Experimental Relacionado

Updated: Jul 17, 2026

G2-seq: A High Throughput Sequencing-based Technique for Identifying Late Replicating Regions of the Genome
06:40

G2-seq: A High Throughput Sequencing-based Technique for Identifying Late Replicating Regions of the Genome

Published on: March 22, 2018

Un origen cromosómico de la levadura de la replicación del ADN definido por múltiples elementos funcionales.

Y Marahrens1, B Stillman

  • 1Cold Spring Harbor Laboratory, NY 11724.

Science (New York, N.Y.)
|February 14, 1992
PubMed
Resumen

Los investigadores identificaron elementos clave del ADN esenciales para el origen de la replicación del ADN eucariota en Saccharomyces cerevisiae. Estos elementos, similares a la organización promotora, requieren activadores transcripcionales para su funcionamiento.

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Determination of S-Phase Duration Using 5-Ethynyl-2'-deoxyuridine Incorporation in Saccharomyces cerevisiae
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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Genética La genética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • La replicación del ADN eucariótico se inicia desde orígenes discretos en los cromosomas.
  • La organización precisa y los elementos funcionales de estos orígenes no se comprenden completamente.

Objetivo del estudio:

  • Aclarar la organización detallada y los componentes esenciales de un origen de replicación cromosómica eucariota.
  • Investigar el papel de elementos específicos del ADN y factores de transcripción en la función de origen.

Principales métodos:

  • Construcción y análisis funcional de mutantes de sustitución de enlaces en el origen ARS1 de Saccharomyces cerevisiae.
  • Caracterización de los elementos esenciales del ADN (A, B1, B2, B3) y su disposición.
  • Investigación del papel del sitio de unión ABF1 (B3) y los activadores de la transcripción.

Principales resultados:

  • Se identificaron cuatro elementos esenciales (A, B1, B2, B3) para la función de origen del ARS1.
  • Demostró que estos elementos, cuando están dispuestos correctamente, funcionan de manera eficiente incluso en secuencias no relacionadas.
  • Se demostró que el elemento B3 es un sitio de unión de ABF1 y que se requieren activadores de transcripción.

Conclusiones:

  • Los orígenes de la replicación cromosómica en los eucariotas son estructuras multipartitas.
  • La función de los orígenes de la replicación comparte similitudes con la organización promotora eucariota, que involucra elementos de ADN y activadores transcripcionales.